add --ignore

src/args.rs

@@ -14,4 +14,12 @@ pub struct Args {
     /// where your backup will be stored
     #[arg()]
     pub target: Option<PathBuf>,
+    /// directories to ignore.
+    /// can be paths relative to <source> (like backups/) or paths starting with <source> (like my_source/backups/).
+    /// if <index> starts with <source>, it is automatically ignored and doesn't need to be specified.
+    #[arg(long)]
+    pub ignore: Vec<PathBuf>,
+    /// don't ask for confirmation, just apply the changes.
+    #[arg(long)]
+    pub noconfirm: bool,
 }

src/main.rs

@@ -19,7 +19,14 @@ fn main() {
     let args = args::Args::parse();
     // index diff
     eprintln!("performing index diff...");
-    let changes = match perform_index_diff(&args.source, &args.index) {
+    let source = &args.source;
+    let index = &args.index;
+    let ignore_subdirs = args
+        .ignore
+        .iter()
+        .map(|path| path.strip_prefix(source).unwrap_or(path))
+        .collect();
+    let changes = match perform_index_diff(source, index, ignore_subdirs) {
         Ok(c) => c,
         Err(e) => {
             eprintln!("Failed to generate index diff:\n    {e}");
@@ -44,12 +51,25 @@ fn main() {
         eprintln!("  +  add/update file");
         eprintln!("  -  remove file");
         eprintln!(" [-] remove directory (and all contents!)");
-        eprintln!("Press Enter to to apply these actions.");
+        // apply changes after confirming
+        if !args.noconfirm {
+            let mut line = String::new();
+            loop {
                 if args.target.is_none() {
-            eprintln!("[WARN] You didn't set a `target` directory!\n[WARN] Be careful not to update your index without actually applying the changes to the `target` filesystem!");
+                    eprintln!("[WARN] You didn't set a `target` directory!\n[WARN] Be careful not to update your index without actually applying the changes to the `target` filesystem!\nType 'Ok' and press enter to continue.");
+                } else {
+                    eprintln!("Exclude unwanted directories/files using --ignore,\nor press enter to apply the changes.");
+                }
+                line.clear();
+                std::io::stdin().read_line(&mut line).unwrap();
+                let line = line.trim().to_lowercase();
+                if line == "exit" {
+                    return;
+                } else if args.target.is_some() || line == "ok" {
+                    break;
+                }
+            }
         }
-        // apply changes
-        if std::io::stdin().read_line(&mut String::new()).is_ok() {
         match apply_indexchanges(&args.source, &args.index, &args.target, &changes) {
             Ok(()) => {}
             Err(e) => {
@@ -58,5 +78,4 @@ fn main() {
             }
         }
     }
-    }
 }

src/update_index.rs

@@ -2,14 +2,22 @@ use std::{collections::HashMap, fs, io, path::Path};
 
 use crate::{indexchanges::IndexChange, indexfile::IndexFile};
 
-pub fn perform_index_diff(source: &Path, index: &Path) -> io::Result<Vec<IndexChange>> {
+pub fn perform_index_diff<'a>(
+    source: &Path,
+    index: &'a Path,
+    mut ignore_subdirs: Vec<&'a Path>,
+) -> io::Result<Vec<IndexChange>> {
     let mut changes = Vec::new();
+    if let Ok(inner_index) = index.strip_prefix(source) {
+        eprintln!("[info] source contains index, but index will not be part of the backup.");
+        ignore_subdirs.push(inner_index);
+    }
     rec(
         source.as_ref(),
         Path::new(""),
         index,
         &mut changes,
-        index.strip_prefix(source).ok(),
+        &ignore_subdirs,
     )?;
     Ok(changes)
 }
@@ -23,11 +31,10 @@ fn rec(
     // list of changes to be made
     changes: &mut Vec<IndexChange>,
     // if the index is part of `source`, where exactly is it?
-    inner_index: Option<&Path>,
+    ignore_subdirs: &Vec<&Path>,
 ) -> Result<(), io::Error> {
-    if let Some(ii) = &inner_index {
+    for ii in ignore_subdirs {
         if rel_path.starts_with(ii) {
-            eprintln!("[info] source contains index, but index will not be part of the backup.");
             return Ok(());
         }
     }
@@ -62,7 +69,7 @@ fn rec(
                 &rel_path.join(entry.file_name()),
                 index_files,
                 changes,
-                inner_index,
+                ignore_subdirs,
             )?;
         } else {
             if let Some(true) = in_index_and_is_dir {